If you're getting plumbing work done and your plumber mentions PEX, here's what you should know. PEX is the flexible plastic pipe that's replaced copper in most residential plumbing. It's cheaper, faster to install, and doesn't corrode. But the pipe is only half the story — how the fittings connect matters too.
There are three main fitting types you'll hear about — F1807 (crimp), F1960 (expansion), and F2159 (push-fit). I'll explain each one straight.
F1807 — Crimp Fittings
This is the most common one. A brass or poly fitting goes inside the pipe, a copper ring goes around the outside, and a crimp tool squeezes the ring down tight. Done right, it's a solid connection that's been used for decades.
When it makes sense: Most residential work. It's fast, the tools are affordable, and every plumber knows how to do it. Good all-around choice.
F1960 — Expansion Fittings
This is the Uponor/Wirsbo system. Instead of crimping a ring, you use an expansion tool to stretch the pipe open, slide the fitting in, and the pipe shrinks back down around it. No rings, no clamps — just the pipe gripping the fitting.
When it makes sense: Also great for residential work. The connection has full flow (no fitting narrowing the pipe inside), which some plumbers prefer. The tools cost more, so not every plumber carries them.
F2159 — Push-Fit Fittings
These are the SharkBite-style fittings. You push the pipe in and internal teeth grab it. No tools needed at all.
When it makes sense: Quick repairs, tight spots, or temporary fixes. I don't recommend them for permanent installations behind walls — they cost a lot more per fitting and I want something I can trust long-term where I can't see it.
So Which One Should Your Plumber Use?
Honestly? Crimp and expansion are both good. I've used both and I stand behind both. What matters more is that the plumber knows what they're doing — proper technique, the right pipe for the job, and fittings rated for your water system.
What to Ask Your Plumber
- What fitting system do you use, and why?
- Are your fittings rated for PEX-A, PEX-B, or both?
- Do you pressure-test before closing up walls?
If a plumber can't answer these clearly, that's a red flag.
Need plumbing work done in Barrie, Orillia, or Simcoe County? Check out https://conceptsplumbing.ca or book online in under a minute: https://calendly.com/conceptsinc/plumbing-estimate-service
Mark Johnston Concepts Plumbing — (705) 715-1513 Free Estimates. Honest Solutions.
